构建快速公交系统无缝衔接旅游区域与城际轨道站的分析与探索

本文分析了大中城市中短途休闲旅游的交通出行特征,探讨了当前中短途休闲旅游交通出行方式中存在的公共交通分担率较低等问题,论述了当前交通需求下积极构建快速公交系统无缝衔接休闲旅游景区与城际轨道站点的必要性.结合交通运输部提出的快进的旅游交通运输系统指示,通过构建无缝衔接换乘体系,打造能够适应当前休闲旅游舒适、安全、便...     

天津滨海新区沿海潮流特征及通航条件分析

建立涵盖天津新港、海河口港区、临海产业区、南港工业区等天津港主要港区的海域潮流二维数学模型,并通过实测潮流、潮位资料进行模型率定.在计算成果与实测资料的误差满足精度要求后,通过潮流数学模型模拟分析项目建设前、后工程附近海区的潮流分布特征,对主要港区和进港航道口门附近的通航水流条件进行综合评价.     

高速公路施工区限速标志位置确定方法

根据驾驶人的视认性和短时记忆理论, 分析了限速标志影响下的驾驶人自适应性和车辆的易操控性, 计算了高速公路施工区内限速标志的前置、后置和重复距离。基于高速公路施工区长度划分计算模型, 考虑了车辆排队长度、驾驶人短时记忆以及重复距离等因素, 提出了高速公路施工区限速标志位置确定方法, 并运用VISSIM仿真软件进行实例验证。仿真结果表明: 在最低限速为40 km·h^-1 、大车混入率为40%条件下, 当交通量为1 400 pcu·h^-1时, 一、二、三级限速标志的最小冲突率分别为0.06、0.10、0.21次·m^-1, 最大冲突率分别为0.56、0.14、0.23次·m^-1; 当交通量为1 960 pcu·h^-1时, 三级限速标志的最小冲突率分别为0.84、0.28、0.36次·m^-1, 最大冲突率分别为0.87、0.31、0.40次·m^-1; 当交通量为2 240 pcu·h^-1时, 三级限速标志的最小冲突率分别为0.72、0.31、0.39次·m^-1, 最大冲突率分别为0.74、0.34、0.48次·m^-1。     

Car-free city centres

In a car-free city centre car traffic is limited by an area-wide ban to its functionally necessary share. This usually includes delivery and service vehicles and residents' cars. The lock-out of unnecessary car traffic must not be an isolated measure, but part of a pulland-push approach. The most important supporting measure concerns the provision of attractive public transport services. Case studies from Bologna, Lubeck, Aachen, York, and Nuremburg are reported.     

小曲率薄壁热煨弯管前过渡区支撑器

文中指出了小曲率、薄壁感应热煨弯管前过渡区出现的成型问题,分析感应加热弯曲时前过渡区的受力状况和变形稳定性,从加强前过渡区钢管热弯曲时的稳定性出发,设计了伸缩自如、支撑力大、自身质量轻、装卸方便、通用性强的前过渡区支撑器。由应用前后的对比可知,前过渡区出现的问题得到根本解决。     

公路隧道开挖与支护数值模拟分析

文章以某公路隧道为工程背景,采用Midas/GTS有限元程序对其施工过程进行二维弹塑性数值模拟,分析得出施工阶段隧道围岩位移、应力的变化规律和开挖引起的塑性区,以及初期锚喷支护结构所产生的内力,为公路隧道设计和施工提供理论依据和指导。     

Public Stakeholders' Perception of ICZM and Coastal Erosion in the Mediterranean

The Mediterranean area plays a pivotal role within the definition and implementation of regional strategies for integrated coastal zone management (ICZM). Under the umbrella of the Regional Framework Operation BeachMed-e, a research project was carried out in five Mediterranean EU regions (East Macedonia and Thrace in Greece, Lazio, Liguria, and Emilia Romagna in Italy and Languedoc-Roussillon in France), in order to study the different approaches to ICZM that have been applied and also to test new approaches to these regions. The aim of this article is to present and discuss the results of the common surveys conducted in order to investigate the institutional stakeholders’ perception on ICZM in the five Mediterranean regions considered. The results are presented region by region, while comparisons are carried out among regions. Summarizing the results it can be stated that some differences and common problems affecting the coastal decision-makers of the five Mediterranean regions considered were identified. Particularly, stakeholders involved in coastal management generally perceived a lack of collaboration and a poor information exchange in all the regions, resulting sometimes in a lack of awareness on coastal erosion issues.     

箱涵刚域效应研究

箱涵刚域效应是指结构在节点处,由于构件相交而存在的性质特殊的区域,该区域的相对抗弯刚度趋近无限大,呈现出不可变形的特性,从而对结构受力和变形产生影响的现象。为研究刚域效应对箱涵结构的影响,对箱涵进行受力和变形的特性分析,确定刚域及其判定方法。以箱涵的基本参数和加腋特征参数为变量,分析箱涵结构刚域效应的规律。并对比分析考虑刚域效应后结构变形和内力结果,经分析确定出顶板和侧墙的刚域范围与结构尺寸之间的比例关系,以及加腋构造的最优坡度。考虑刚域效应后的变形和内力值较小,可以减小钢筋用量,降低工程造价。     

Application of Vertical Freezing Technique in the Deep-buried Mountain Railway Tunnel北大核心CSCD

The strata of Chengershan tunnel is mainly consist of the slightly cemented tertiary sandstone, the tun⁃ nel body passes through F 2 fault core zone. Geological disasters of mud outburst, sand gushing and extrusion of work face occurred several times during tunnel construction, so the risks are very high. In view of the core zone of F 2 fault with high pressure and abundant water, a variety of construction schemes were compared and analyzed in terms of technology, feasibility and safety, and vertical freezing technique was used for stratum reinforcement in the railway tunnel for the first time, furthermore the freezing scheme and tunnel support measures were studied, providing refer⁃ ence and guidance for similar tunnel construction.Mountain railway tunnel; Fault zone; Tertiary sandstone; Vertical freezing technique; Application © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved.     

信号控制交叉口绿灯间隔时间计算的研究

针对信号控制交叉口由于绿灯间隔时间设置不当而可能导致的困境区域问题,结合路口限速、交叉口几何条件等客观因素,提出分析模型和最小绿灯间隔时间的计算公式,同时针对几种可能出现的情况,提出相关的建议,以达到消除困境区域的目的。